What about SEO?

Tank sites are built with Google and co in mind: all sites
features clean, readable URLs built on a valid XHTML structure.
There isn't much more to do for most users, but those with more
time on their hands can choose to get their hands dirty with alt
and meta tags too.

How much 'love' you get from the search engines now depends on
the content you add, the descriptors and tags you create, and the
links you build.

Sitemap, check

An XML sitemap is auto-generated as you build and manage your
site, and this feed can be submitted to search engines to ensure
that all your content is indexed properly.